<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>CSS盒子模型</title>
<style>
	body{ border : 1px black dashed; }
	#box1{  width : 200px; height : 200px; background : blue; 
		overflow : hidden;  }
	#box2{  width : 100px; height : 100px; background : yellow;
		margin-top : 30px; }
</style>
</head>
<body>
<div id="box1">
<div id="box2">做真实的自己，用良心做教育！</div>
</div>
</body>
</html>




